- Use SERIALCON instead of systemd override for serial console
- Remove fdtfile from bootenv (use BOOT_FDT_FILE instead)
- Remove ATF_COMPILER (arm64 default)
- Inline OPTEE variables into fetch_sources_tools hook
- Remove empty family_tweaks() and family_tweaks_bsp()
- Use only debug mode for ATF build
- Build fiptool in atf_custom_postprocess
- Move header creation inline into uboot_custom_postprocess
- Use <<- heredoc for Python script
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